Abstract
The photocatalytic reduction of CO 2 was investigated using TiO 2 powders in supercritical fluid CO 2. These were irradiated in a stainless steel vessel at 9.0 MPa and 35°C. After reducing the CO 2 pressure to the ordinary state, pure water was added to the vessel while avoiding air contamination. No gaseous reduction products were observed. Formic acid was obtained only in aqueous solution. The optimal irradiation time for the production of formic acid was 5 h. Addition of acidic solutions rather than pure water was preferable for formic acid formation. Formic acid seems to be produced through the protonation of reaction intermediates on TiO 2 powders in solutions. The CO 2-reduction system described here may be of practical value for efficient CO 2-conversion and fixation, storage of solar energy, and production of raw materials for the photochemical industry.
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